He worked for recovery of the Holy Land to Christendom. He preached a Crusade, insisting that all the clergy donate a percentage of their income to the cause for three years to finance it. Many volunteered for service, but since the European powers were constantly at war, these volunteers included old men, women, children, criminals, and others ill-suited for combat. They set sail in 1217 and had some success, but the lack of troops, lack of leadership, and lack of unity among the leaders led to failure. Frederick II, who had sworn to fight in 1217 but hadn’t, agreed to lead the next Crusade. He obtained a series of postponements from Honorius, who crowned him Holy Roman Emperor on 22 November1220, and finally sailed in August 1227.